Atec Agilent-E4437B - Manual (Page 14)

14
I/Q baseband generator
(continued)
Modulation QPSK π/4DQPSK 16QAM 2FSK GMSK
Filter Root Nyquist Gaussian
Filter factor ( α or BbT) 0.25 0.25 0.25 0.5 0.5
Modulation index N/A N/A N/A 0.5 N/A
Symbol rate (Msym/s) 4 4 4 1 1
Error vector magnitude 1,2 Shift error 1,2 Global phase error 1,2
(% rms) (% rms) (degrees rms)
fc = 1 GHz (0.9) (0.9) (0.8) (0.7) (0.2)
fc = 2 GHz (1.0) (1.0) (1.0) (0.7) (0.2)
fc = 3 GHz (1.5) (1.5) (1.4) (0.8) (0.4)
fc = 4 GHz (2.8) (2.6) (3.5) (1.0) (0.5)
Baseband EVM performance versus symbol rate
(root Nyquist filter, modulation = QPSK)
RF EVM performance versus symbol rate
(fc = 1 GHz, root Nyquist filter, ALC = off, modulation = QPSK)
RF EVM performance versus frequency
(root Nyquist filter, a = 0.25, ALC = off, modulation =
π/4DQPSK)
Effects of automatic level control (ALC) on EVM performance
(fc = 1 GHz, root Nyquist filter, a = 0.25, modulation = QPSK)
Typcal performance (power levels
≤ + 4 dBm [≤ + 8 dBm, Option UNB])
PSK formats
1. Specifications apply at power levels ≤ +4 dBm, Option (UNB) with default scale factor of I/Q outputs.
2. Parentheses denote typical performance.
Custom digitally modulated signals